/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.tsfile.utils;

import java.io.Serializable;

/**
 * Pair is a template class to represent a couple of values. It also override
 * the Object basic methods like hasnCode, equals and toString.
 *
 * @param <L> L type
 * @param <R> R type
 */
public class Pair<L, R> implements Serializable {

  private static final long serialVersionUID = -1398609631703707002L;
  public L left;
  public R right;

  public Pair(L l, R r) {
    left = l;
    right = r;
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((left == null) ? 0 : left.hashCode());
    result = prime * result + ((right == null) ? 0 : right.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    Pair<?, ?> other = (Pair<?, ?>) obj;
    if (left == null) {
      if (other.left != null) {
        return false;
      }
    } else if (!left.equals(other.left)) {
      return false;
    }
    if (right == null) {
      if (other.right != null) {
        return false;
      }
    } else if (!right.equals(other.right)) {
      return false;
    }
    return true;
  }

  @Override
  public String toString() {
    return "<" + left + "," + right + ">";
  }
}
